Since yesterday evening I've had the following issue with my (home-brewn) Linux (OpenSuSE Leap 15.0) home server: One of its two on-board ethernet links keeps going down, then up, then down again,… quite often.
Normally, these outages last for a couple of seconds and get unnoticed, but I've also had downtimes of several minutes. One of them even causes the RAID on my server lose its consistency.
Here is the output of dmesg (messages of the other network interface, which is not affected, have been deleted):
[ 815.518384] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 835.069925] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 838.322327] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 897.277739] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 900.218140] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 974.621515] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 977.501918] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1069.501256] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1073.073644] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1126.653085] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1129.465504] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1440.928076] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1444.176477] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1447.680055] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1450.888453] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1532.575777] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1535.812158] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1554.875708] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1557.728109] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1688.103281] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1691.411675] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1753.243072] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1756.119469] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1781.274983] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 1814.927299] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 1839.818791] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 2108.682340] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 2119.769891] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 2128.118276] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 2172.877720] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 2203.106035] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 2207.337608] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 2465.245184] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 4206.183121] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Down
[ 4209.203544] igb 0000:01:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
The network interface is an I210 Gigabit Network Connection (eth2) on an Asus board. And here is the OS version:
╭─root@valen ~
╰─➤ uname -a
Linux valen 4.12.14-lp150.12.64-default #1 SMP Mon Jun 17 16:53:50 UTC 2019 (3edfd41) x86_64 x86_64 x86_64 GNU/Linux
The last system update was last Tuesday, but the problems started Friday evening, so I don't think this is a driver issue.
What can be the cause? Thank you.
UPDATE:
Upon request, here is the ethtool output:
╭─root@valen ~
╰─➤ ethtool -S eth2
NIC statistics:
rx_packets: 257315
tx_packets: 603706
rx_bytes: 85237411
tx_bytes: 775258267
rx_broadcast: 1023
tx_broadcast: 419
rx_multicast: 75
tx_multicast: 104
multicast: 75
collisions: 0
rx_crc_errors: 0
rx_no_buffer_count: 0
rx_missed_errors: 0
tx_aborted_errors: 0
tx_carrier_errors: 0
tx_window_errors: 0
tx_abort_late_coll: 0
tx_deferred_ok: 0
tx_single_coll_ok: 0
tx_multi_coll_ok: 0
tx_timeout_count: 0
rx_long_length_errors: 0
rx_short_length_errors: 0
rx_align_errors: 0
tx_tcp_seg_good: 82646
tx_tcp_seg_failed: 0
rx_flow_control_xon: 21
rx_flow_control_xoff: 21
tx_flow_control_xon: 0
tx_flow_control_xoff: 0
rx_long_byte_count: 85237411
tx_dma_out_of_sync: 0
tx_smbus: 0
rx_smbus: 0
dropped_smbus: 0
os2bmc_rx_by_bmc: 0
os2bmc_tx_by_bmc: 0
os2bmc_tx_by_host: 0
os2bmc_rx_by_host: 0
tx_hwtstamp_timeouts: 0
tx_hwtstamp_skipped: 0
rx_hwtstamp_cleared: 0
rx_errors: 0
tx_errors: 0
tx_dropped: 0
rx_length_errors: 0
rx_over_errors: 0
rx_frame_errors: 0
rx_fifo_errors: 0
tx_fifo_errors: 0
tx_heartbeat_errors: 0
tx_queue_0_packets: 103348
tx_queue_0_bytes: 114658835
tx_queue_0_restart: 0
tx_queue_1_packets: 61601
tx_queue_1_bytes: 77258944
tx_queue_1_restart: 0
tx_queue_2_packets: 94305
tx_queue_2_bytes: 97486823
tx_queue_2_restart: 0
tx_queue_3_packets: 344452
tx_queue_3_bytes: 483419252
tx_queue_3_restart: 0
rx_queue_0_packets: 30966
rx_queue_0_bytes: 4981061
rx_queue_0_drops: 0
rx_queue_0_csum_err: 0
rx_queue_0_alloc_failed: 0
rx_queue_1_packets: 137558
rx_queue_1_bytes: 65059503
rx_queue_1_drops: 0
rx_queue_1_csum_err: 0
rx_queue_1_alloc_failed: 0
rx_queue_2_packets: 42880
rx_queue_2_bytes: 7877235
rx_queue_2_drops: 0
rx_queue_2_csum_err: 0
rx_queue_2_alloc_failed: 0
rx_queue_3_packets: 45911
rx_queue_3_bytes: 6290352
rx_queue_3_drops: 0
rx_queue_3_csum_err: 0
rx_queue_3_alloc_failed: 0
